%0 Journal Article
%A Turing, A. M.
%T The extensions of a group
%J Compositio Mathematica
%D 1938
%P 357-367
%V 5
%I Johnson Reprint Corporation
%U http://www.numdam.org/item/CM_1938__5__357_0/
%G en
%F CM_1938__5__357_0